One outlet accepts new coin (6)
I believe the answer is:
invent
'coin' is the definition.
(I've seen this before)
'one outlet accepts new' is the wordplay.
'one' becomes 'i' (Roman numeral).
'outlet' becomes 'vent' (I've seen this before).
'accepts' is an insertion indicator.
'new' becomes 'n'.
'i'+'vent'='ivent'
'ivent' going around 'n' is 'INVENT'.
(Other definitions for invent that I've seen before include "Coin" , "Devise (something new)" , "Conceive" , "Think up, create" , "Create like Edison" .)